GPIO driving

RE: GPIO driving

Vidar Berg — Fri, 28 Mar 2025 14:21:58 GMT

'west flash' which is invoked by the vs code extension when you load the merged.hex will also run 'nrfjprog --pinresetenable' that enables the pinreset functionality by writing to the NV PSELRESET registers. To avoid having to do this, you can enable CONFIG_GPIO_AS_PINRESET in your project config.

RE: GPIO driving

piseek — Fri, 28 Mar 2025 11:40:57 GMT

Tidar, thank you! This solved the issue.

Now, I've encountered another problem related to flashing.

When I flash the app and bootloader using the VS Code plugin, I can enter MCUboot for serial DFU (UART).
However, when I flash the merged.hex file using SEGGER J-Flash Lite, I’m unable to enter MCUboot.
If I then reflash just the app with VS Code, it works again.

I enter MCUboot by toggling the boot and reset pins.

DFU over BLE always works.

I suspected the issue is related to the boot pin, but it is the reset pin. When polled down it does nothing

Could you please advise?

RE: GPIO driving

Vidar Berg — Thu, 27 Mar 2025 13:21:55 GMT

Hello,

Pin P0.9 and P0.10 are assigned to the NFC by default. To use them as regular GPIOS, you can add CONFIG_NFCT_PINS_AS_GPIOS=y to your prj.conf file or edit your board file to enable this config setting by default. This configuration will make the startup code check the NFCPINS register on startup and update it if needed.

(pin assigments)

Best regards,

Vidar